package netty.dubborpc.netty;


import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Executor;

/**
 * Created by IntelliJ
 * Author:熊磊
 */
public class NettyClient {
    //创建一个线程池
    private static ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private static NettyClientHandler client;
    //编写方法使用代理模式,获取代理对象
    public Object getBean(final Class<?> serivceClass, final String providerName) {

        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                new Class<?>[]{serivceClass}, (proxy, method, args) -> {

                    //{}  部分的代码，客户端每调用一次 hello, 就会进入到该代码
                    if (client == null) {
                        initClient();
                    }

                    //设置要发给服务器端的信息
                    //providerName 协议头 args[0] 就是客户端调用api hello(???), 参数
                    client.setPara(providerName + args[0]);

                    //
                    return executor.submit(client).get();

                });
    }

    private static void initClient(){
        client = new NettyClientHandler();
        NioEventLoopGroup group = new NioEventLoopGroup();
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY,true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel channel) throws Exception {
                        channel.pipeline()
                                .addLast(new StringDecoder())
                                .addLast(new StringEncoder())
                                .addLast(client);
                    }
                });
        try {
            bootstrap.connect("127.0.0.1", 7000).sync();

        } catch (InterruptedException e) {
            e.printStackTrace();
        } finally {
            //group.shutdownGracefully();
            //客户端不要关闭group ,
        }

    }
}
